Daniel w



(No Model.) A

D. W. WARREN.

GRIP 1N9; PULLBY.

Patented Apr. 4, 1882.

WITNESSES ATTORNEYS.

N. PETERS Hula-Lithographer. Wlallinghm. D. C.

UNITED STATES PATENT OFFICE.

DANIEL WARREN, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND JOHN H.BLAISDELL, OF 'SAME PLACE.

GRlPPlNG-PULLEY.

' SPECIFICATION forming part of Letters Patent No. 255,827, dated April4, 1882.

Application filed August 29, 1881.

and the invention consists of a double circle of clamps or leverspivoted between the two annular pulley-sections, with their smallerandcurved ends converging to the pulley center and their broad headsprojecting into the groove between the rims ot'the pulley-sections, oneseries or circle of the levers having their heads projected beyond thoseof the other se ries to form in effect a movable inner flange for thelarger pulley, while the other series or circle forms in effect amovable inside flange for the smaller pulley; and itconsists,further, oftwo movable pulley centers or disks centrally through which thehorizontal pulleyarbor passes, having annular inclined planes on theirinner faces, which disks are applied and held to the opposite sides ofthe pulley, over the central opening thereof, by screws or other device,so that their inclined planes form an annular groove into which theinner ends of the levers project, and so that when the said pulley is inoperation aweight suspended from it will operate to draw its annularsections and attached levers down in such a manner that the lower endsof those levers above the median horizontal line of the pulley, whichare vertical, or nearly so, are brought in contact with the inclinedfaces of the disks, and are thereby brought together in successivepairs, whereby the said levers are spread or thrown apart at their topswith the effect of Contract ing the pulley-grooves at those points, andthereby compressing the rope or chain. As the pulley revolves and theupper levers are thereby released from the disks those following inorder become engaged in them, and the lowest levers are by their gravityalways disengaged from said disks.

Figure 1 is a side elevation of my improved pulley with connected hookblock or sheave and tackle. Fig. 2 is a sectional edge elevation'of thepulley. Fig. 3 is an edge elevation (No model.)

be applied without projecting beyond the faces of'thepullevfianges b c.ThesesectionsA A,

though of different diameters, have central openings, d, of equaldiameters, as shown. In

their inner edges are formed opposite recesses f, so that when saidsections AA are put together to form a pulley these recesses f formsockets with intermediate blocks, g, and in these socketsf, on pins h,that are jourualed in bearings z in the blocks g, are pivoted, in pairs,the compression-leversB. The inwardproiecting points of these levers Bare rounded or beveled off on their outer faces, as shown at k, toconform with the V-shaped groove at between the disks 0, and said pointsare of equal lengths. In each pair of these levers B, however, the headof one projects farther outward than that of the other, the longerlevers B forming in effect the inside movable flange of the largerpulley, while the shorter levers B form in effect the inside movableflange of the smaller pulley. The outer faces of these lever-heads arepreferably ribbed or corrugated, as shown at n, for establishing, incombination with corresponding ribs or corrugations, 0, on the inside ofthe pulley-flanges. b 0, a better hold or greater friction upon the ropeor chain D. r

The central disks, 0, that are applied over the central opening, (I, andare held together by bolts or screws 1) passing through them, haveformed on their inner faces flat circular tables q, of less diameterthan the opening d, and the edges of these tables q are beveled off orinclined, as shown at r, for contact with the beveled ends of the leversB, these disks O being movable relatively to the pulley-sections A. Anarbor, E, passing horizontally through the centers of the disks 0,supports the device in the frame F, which latter is provided withguide-rolls G for directing the rope or chain D.

The device is suspended by hook H, and a hook block or sheave, I, isheld in the bight of the rope or chain D, after the ordinary manner ofarranging differential pulleys.

It will be seen that the pulley rings or sections A A carry the rope orchain D, that the levers B compress said rope D, and thereby prevent itsslipping, and that the disks 0 support the load that may be attached tothe sheave I. The heavier the load attached to the device the greaterthe force with which the rings or sections A A will be forced down withtheir attached levers B, and in the same measure the inner ends of thosevertical, or nearly vertical, levers that may be above the medianhorizontal line of the pulley, and are pressed by the rope D, are forcedbetween the inclined faces of the disks 0, and the heads of said leversthereby forced outward to compress and hold the rope D. As the saidpulley revolves the upper levers, B, break contact with the rope D, andfall outward by their own gravity, with their heads approached to eachother, as shown in Fig. 2.

I do not confine myself to the precise construction of parts as hereinshown and described, as it is manifest that modifications may be madewithout departing from my invention.

Having thusdescribed my invention, Iclaim as new and desire tosecure byLetters Patent 1. A pulley constructed substantially as herein shown anddescribed, consisting of flanged annular sections or rings A A,compressionlevers B, and central disks, 0, provided with inclinedplanes, as set forth.

2. In a pulley, as a means for supporting the rope in position,theflanged annular sections A A(, substantially as herein shown anddescribed.

3. In a pulley, as a means for compressing and holding the pulley-rope,the compressionlevers B, substantially as herein shown and described.

4. In a pulley provided with compressionlevers B, the supporting-disks0, having inclined faces,substantiallyas herein shown and described,whereby said levers are operated, as set forth.

5. The combination, with the flanged annularpulley-sections A A,provided with sockets f, of the pivoted compression -levers B and disksand arbor O E, the said disks forming an annular groove, substantiallyas herein shown and described.

6. In a pulley, as a means for compressing and holding the rope, thecombination of com.- pressing-levers and inclined planes movingrelatively to each other as set forth.

DANIEL W. WARREN.

Witnesses:

O. SEDGWIOK, JACOB J. S'roR-Ea.

